Thermistors: Everything You Should Know
Thermistors: Everything You Should Know
Blog Article
Introduction
BTS50085-1TMA Thermistor is a sensor resistor whose resistance value changes with temperature. Thermistor consists of sensitive material, lead wire, package body and other parts. The sensitive material is the core part of the thermistor, which is usually made of metal oxide or polymer material. The lead wire is used to connect the external circuit, generally using tinned copper wire or nickel-plated copper wire. The package body mainly plays a protective and insulating role. Common packaging materials include epoxy resin, glass and ceramic.
Types
BTS50085-1TMA Thermistors can be divided into two categories according to the characteristics of their resistance changing with temperature: negative temperature coefficient thermistors (NTC) and positive temperature coefficient thermistors (PTC).
Negative temperature coefficient thermistor (NTC)
Introduction: The resistance value of NTC thermistors decreases as the temperature increases. They are usually made of metal oxides such as manganese oxide, nickel oxide, cobalt oxide, etc., and are formed by a sintering process. This characteristic makes NTC thermistors widely used in temperature measurement and temperature compensation circuits.
Positive temperature coefficient thermistor (PTC)
Introduction: The resistance value of BTS50085-1TMA PTC thermistors increases as the temperature increases. They are mainly made of ceramic materials such as barium titanate, and use the characteristics of the material undergoing phase change above a certain temperature point. PTC thermistors are often used in applications such as overcurrent protection and resettable fuses.
Operating Principle
In an BTS50085-1TMA NTC thermistor, the resistance decreases as the temperature increases. This behavior is due to the increased mobility of charge carriers (electrons and holes) in the thermistor material at higher temperatures, which allows for easier current flow. Conversely, in a PTC thermistor, the resistance increases as the temperature rises. This occurs because at higher temperatures, the material undergoes a phase transition or an increase in lattice vibrations that impede the flow of charge carriers.
Features
High sensitivity, its resistance temperature coefficient is 10 to 100 times greater than that of metal
Wide operating temperature range, normal temperature devices are suitable for -55℃ to 315℃, high temperature devices are suitable for temperatures above 315℃, and low temperature devices are suitable for -273℃ to -55℃
Small size, can measure the temperature of gaps, cavities and blood vessels in organisms
Easy to use, resistance value can be selected between 0.1 and 100kΩ
Easy to process into complex shapes, can be mass-produced
Strong overload capacity
Applications
Temperature sensors
Household appliances
Motors and transformers
Chargers
Power supplies
Power tools and appliances
Electronic thermometers
Medical diagnostic equipment
Engine temperature monitoring
Seat heaters
Advantages & Disadvantages
| Advantages | Disadvantages |
| 1.Provide highly sensitive temperature measurements 2.Thermistors respond quickly to temperature changes 3.They are generally inexpensive 4.Thermistors can withstand harsh environmental conditions | 1.The relationship between resistance and temperature is highly nonlinear 2.The consistency and interchangeability of components are poor 3.The components are prone to aging 4.Most thermistors are only suitable for the range of 0 to 150°C |
FAQs
How do you choose the right thermistor for an application?
Choosing the right thermistor involves considering factors such as the required temperature range, sensitivity, accuracy, size, and environmental conditions of the application.
How do you install a thermistor in a circuit?
Thermistors are typically installed in circuits by soldering their leads to the appropriate points on a PCB or connecting them to terminals.
What is self-heating in a thermistor, and how does it affect performance?
Self-heating occurs when a current passing through the thermistor generates heat, which can affect resistance measurement. This can be mitigated by using low current levels or by compensating for the self-heating effect in the circuit design.
Conclusion
In conclusion, BTS50085-1TMA thermistors have been increasingly used in temperature monitoring and control. In addition, thermistor alloys have also been used in atmospheric total temperature sensors for high-performance aircraft and temperature sensors for large passenger aircraft. It can be seen that the advantages of thermistors will become increasingly significant.